Piston-head



F. ElLERS.

' PISTON HEAD A-PPLKCATION FILED HOV-1.1919.

Patented Apr. 20, 1920.

ITED $TATE$ PUMP COMPANY, A CORPORATION SF INDIANA.

PESTGNE'IEAD.

es-z nes.

Application filed November 1, 1919.

To all whom it may con ern:

Be it known that l, FRANK Entries. a citizen of the United States of Americe and resident of Fort lVuyne, in the county of Allen and State of Indians, have invented certain new and. useful Improvements in Piston-Heads, or" which-the following is a specification.

This invention relates to improvements in pistonheacls of the valvular type for dis placement pumps of that class used in dispensing liquid. in unit quantities measured by the length of stroke or the piston. The object of the improvement is to provide. an inexpensive, durable and efficient piston head with parts so constructed. and arranged as to be easily assembled.

The object of the invention is accomplished by the construction illustrated the accompanying drawings in which;--

Figure l is a. transverse section of a pump cylinder in which is shown at top View of the improved piston head, parts thereof heing broken away; and

Fig. 2 is an elevation of the some shown portly broken away and in section.

Similar characters of reference indicate corresponding parts throughout the views and having reference now to the same:

1 is a pump cylinder of usual construction, and 2 is a pump red, the lower end 3 of which is threaded and provided with nuts 4 and 5. The piston head is comprised of a cup-shaped sustaining member 6 having an annular series of passageways 7 that extend through its curved outer part near its perimeter; u flexible valvular member 8 lying Within the hollow of the sustaining member so as to normally close the passage- Ways therein and with its perimeter 9 extending beyond that of the sustaining n1emher and hearing against the inner wall of the cylinder; and an expanding spider l0 tending to hold the valvular member closed over the passage-ways in the sustaining member and with its perimeter pressed against the Walls of the cylinder. Also a retaining disk 11 is arranged concentrically with the sus taining member valvular member and spider fixedly between the nuts l and 5, the disk being positioned above the spider so that the central portion of the latter is held tightly against the corresponding: part of the valvular member. The sustaining memher is metallic and rigid on the pump rod,

Specification of Letters Patent.

Patented Serial No. 335,025.

its outer perimeter fitting loosel" w hin the pump cylinder so as to move freely therein; the Valvular member is of leather or other I suitable flexible material; and the spider made preferably of )I'lIlQ s..eet Fetal shaped with an annular eries ot bowed i 12, each of which has a wide foot 13 at its outer extremity, and u correspoi annular series o'l tongues 1sthst irzerv ie respectively between the arms and within the diameter of the annular of passage-ways in the sustaining 1e; iher. The feet. 13 bear against the \illill r mem- 8 near its perimeter and the con )oncling arms 12 bridge that annular portion or? the valvular member that lies over the series of passage-ways so that the outer valvular member is pressed b against that ennui-or portion '7 int; member beyoinl the '35 s ways and also against tie s they cylinder. The tongues h port of the flexible 'elvular that corresponding fare of one sus member that lies within the a nulzir of passage-ways. Thus, th ('iI LTfll. po oi tlnmlrulnr mernbc and its outer inurgiiiel portion are spring pressed in position one inst the correspondingports of the sustaii'ling member while its intervening annulair-port that covers the passage-ways, bridged by the arms. is unrestrained by direct pressure oi the s; 'tler so that it may be raised by the liquid in its passage under pr ure through the piston head.

1 the operation of the lilftjflfilOfl the lower end of the pump cylinder is connected with the usual suction lin= pro ideril with a foot mire (not shown) so nit li .id drawn into the cylinder therethrc rib is prevented 95 from retracting. the piston is draw; wordly in the cylinder by the. a tion of the pump-rod the titular member is held closed over the passage-Ways and with its perimeter bearing against the cylinder wall- 10G and the cylinder thereupon becomes filled with liquid drawn thereinto through the suction line. During the downward stroke of the piston head liquid previously drn on into the cylinder beneath the piston head flows through the passage-ways and between the valvular and sustaining members. the former being lifted from seated position by pressure oi the liquid as it thus escapes through. the piston head. During the subsequent rise of :10

she piston. the liquid previously admitted hcreth'rou-gh 1S raised in the cylmder and dis harged therefrom in the usual manner and concurrently an additional charge of liquid is drawn into the cylinder and is despatched by repetition of the operation.

The ellicacy of the piston head thus constructed is especially desirable when the pump is depended upon also to effect measurement of the liquid by gaging the extent of the piston stroke thereof in the customary manner. The responsiveness of the valvular member in closing the pa ssage-ways through the sustaining member and its intimate contact with the wall of the cylinder during the upper stroke of the piston is enhanced )by the constant spring pressure of the tongues and feet of the spider, and the readiness of the valvular member in admitting the passage of liquid through the during its downward stroke is effected by forming the spider arms so as to bridge the annular portion of the valvular member that closes over the passage-Ways, thuslpermitting the valvular member to act unrestrained during the upward flow of liquid through the passage-ways.

'hat I claim is:- by 1. In avalvular piston vfor a displacement pump having a cylinder and pump rod, a cup-shaped sustaining member fixed upon the rod and fitting loosely in the cylinder and having an annular series of passageways extending therethrough; a flexible valvular member lying within the hollow of the sustaining member so as to normally close the passage-ways therein and with its perimeter extending beyond that of the sustaining member and bearing against the inner wall of the cylinder: and an expanding spider having radially disposed bowed arms the outer ends of each pressing the corresponding outer portion of the valvular member against the cylinder wall, and having also radially disposedv tongues intervening between said arms respectively tending to I hold the central part of the valvular mem-.

ber in'contact with the corresponding face of the sustaining member, the annular portion of the valvular member extending between the outer ends of the tongues and arms and covering the passage-ways in the sustaining member, being free from direct pressure of the spider.

2. In a valvular piston for a displacement pump having a cylinder, a piston head including a pump rod and a sustaining mempiston I taining member having a her having an annular series of passageways extending therethroughg jn flexible yal-' the valvular member extending beyond that of the sustaining member and bearing against the cylinder wall. I

4. In a valvular piston head for a displacement pump having a cylinder, a perforated sustaining member including a pump-rod attached thereto, a flexible valvular member adapted to close the perforations, its perimeter having bearing relation with the wall of the cylinder 5 aspider hav ing radial arms the outer ends of which tend to hold the perimeter of the valvular member against the cylinder wall; and means in connection with the rod for holding the spider and members in cooperative relation 5. In a valvular piston head for a displacement pump having a cylinder, a susconcentric annular series of passage-ways extending thereth'rough, its perimeter fitting loosely within the cylinder; a flexible valvular member adapted to close the passageways, its perimeter having bearing relation'withj'thewall of the cylinder; a spider having radial arms and tongues intervening respectively therebetween adapted to press the marginal portion of the valvular member against the cylinder wall and that portion of the valvular member lying withinthe series of passage-ways against the sustaining member and leaving the annular portion of the valvular member covering the passage-ways free to rise therefrom without direct obstruction of the spider; and means including a pump rod for securing the spider and members in cooperative relation.

In testimony whereof I affix my signature, in presence of two witnesses.

' FRAN K EILERS. Witnesses:

MATILDA Mn'r'rmn, W. G. Emma. 

